benthamiana, eliminating the need of stable transformants. The function of tissue cells is strongly depends on the extracellular matrix (ECM) that can guide and support cell structure. This support plays a crucial role in the process of cell proliferation and differentiation. Herein, three different nanofibrous scaffolds that are highly attractive for tissue engineering were selected and then osteogenic related genes and protein expression patterns of human adipose-derived mesenchymal stem cells (AT-MSCs) were investigated when grown on substrates. Polycaprolactone, Poly (L-lactic acid) and Polyvinylidene-fluoride nanofibrous scaffolds were fabricated using Electrospinning method and then AT-MSCs viability and osteogenic differentiation were evaluated while cultured on them. The highest AT-MSCs survival rate when grown on the scaffolds was detected when grown on Polyvinylidene-fluoride. In addition, the highest ALP activity and mineralization were also observed in differentiated AT-MSCs has grown on Polyvinylidene-fluoride. The expression levels of Runx2, osteonectin and osteocalcin genes and osteocalcin protein in the AT-MSCs has grown on the Polyvinylidene-fluoride were also significantly higher than the rest of the scaffolds. Based on the results, it seems that since the studied substrate have a similar structural characteristics, their nature may have an important role in the stem cell's osteogenesis process, where the Polyvinylidene-fluoride piezoelectricity was a most distinguished characteristic. BACKGROUND Syncytin-1 and syncytin-2 which are endogenous retroviral genes products play a great role in syncytialization during trophoblast differentiation in normal placental tissues. In aneuploidic placentas due to the low level of pregnancy-induced hormones an alteration was occurred in the syncytialization process, while in the presence of cytogenetically abnormal karyotype the effect of syncytin gene expression levels on syncytialization process and in occured to spontaneous abortions is not clear. To reveal this, we investigated in syncytin-1 and syncytin-2 genes expression levels of chromosomally abnormal and normal trophophoblastic tissues and we also discussed the effect of the syncytin gene expression levels to the occurense of the spontaneous abortion. MATERIAL AND METHODS To each one of the trophoblastic cells; cultivation, harvesting, banding, and analysis were performed and the chromosomes were classified according to the presence of abnormality and normal XY constitution. To exclude the matern syncytin-1 gene. Numerous mutations in the syncytin-1 and syncytin-2 genes (on the expression sites) were detected, and the mutation rate was higher in the syncytin-1 gene compared to the syncytin-2 gene in the patient and in the control groups (p&nbsp; less then &nbsp;0.001). CONCLUSION The results of the study indicate that the expression of the syncytin-2 genes could be altered in the presence of chromosomally abnormal trophoblastic tissues, and these could lead to the loss of pregnancy due to the insufficient syncytialization. In sum, the current research has value for the further studies covering the mechanisms of trophoblast cell fusion, and syncytiotrophoblast regeneration, and thus the pathophysiology of human placental development in the presence of genomic anomaly. We have previously shown that endogenous adenosine 5'-triphosphate (ATP), via P2X3 and P2X2/3 receptors, plays an essential role in carrageenan-induced articular hyperalgesia model in rats' knee joint. In the present study, we used the rat knee joint incapacitation test, Enzyme-Linked Immunosorbent Assay (ELISA), and myeloperoxidase enzyme activity assay, to test the hypothesis that the activation of P2X3 and P2X2/3 receptors by their agonist induces articular hyperalgesia mediated by the inflammatory mediators bradykinin, prostaglandin, sympathomimetic amines, pro-inflammatory cytokines and by neutrophil migration. We also tested the hypothesis that the activation of P2X3 and P2X2/3 receptors contributes to the articular hyperalgesia induced by the inflammatory mediators belonging to carrageenan inflammatory cascade. The non-selective P2X3 and P2X2/3 receptors agonist αβ-meATP induced a dose-dependent articular hyperalgesia, which was significantly reduced by the selective antagonists for P2X3 and P2X2/3 receptors (A-317491), bradykinin B1- (DALBK) or B2-receptors (bradyzide), β1-(atenolol) or β2-adrenoceptors (ICI-118,551), by the pre-treatment with cyclooxygenase inhibitor (indomethacin) or with the nonspecific selectin inhibitor (Fucoidan). αβ-meATP induced the release of pro-inflammatory cytokines TNFα, IL-1β, IL-6, and CINC-1, as well as the neutrophil migration. Moreover, the co-administration of A-317491 significantly reduced the articular hyperalgesia induced by bradykinin, prostaglandin E2 (PGE2), and dopamine. https://www.selleckchem.com/products/vt104.html These findings suggest that peripheral P2X3 and P2X2/3 receptors activation induces articular hyperalgesia by an indirect sensitization of the primary afferent nociceptor of rats' knee joint through the release of inflammatory mediators. Further, they also indicate that the activation of these purinergic receptors by endogenous ATP mediates the bradykinin-, PGE2-, and dopamine-induced articular hyperalgesia. V.Synthetic apolipoprotein A-I (apoA-I) mimetic peptide 5F exhibits anti-atherosclerotic ability with largely unknown mechanism(s). Bone marrow (BM)-derived endothelial progenitor cells (EPCs) play a critical role in vascular integrity and function. The objective of the present study was to evaluate the effect of 5F on endothelial differentiation of BM stem cells and related mechanisms. Murine BM multipotent adult progenitor cells (MAPCs) were induced to differentiate into endothelial cells in vitro with or without 5F. The expression of endothelial markers vWF, Flk-1 and CD31 was significantly increased in the cells treated with 5F with enhanced in vitro vascular tube formation and LDL uptake without significant changes on proliferation and stem cell maker Oct-4 expression. Phosphorylated ERK1/2, not Akt, was significantly increased in 5F-treated cells. Treatment of MAPCs with PD98059 or small interfering RNA against ERK2 substantially attenuated ERK1/2 phosphorylation, and effectively prevented 5F-induced enhancement of endothelial differentiation of MAPCs.